This episode's headline: News Maker; The New NATO; Fountain of Youth?; Youth Swingers. The guests include GEORGI SHAKNAZAROV, Gorbachev Aide; DR. DANIEL RUDMAN, Author, Aging Study; ALEXANDER HAIG, Former NATO Commander; JACK MENDELSOHN, Arms Control Anal; ESSAYIST: ANNE TAYLOR FLEMING. Byline: In Washington: JAMES LEHRER; In New York: JUDY WOODRUFF